Publication: Fl. N. Amer. 1: 174. 1838.
selected vouchers: WTU
Notes: Rare, WNDR.
FNA5 (Hartman and Rabeler): "R. C. Barneby and E. C. Twisselmann (1970) recognized four subspecies of Loeflingia squarrosa, for the most part allopatric. After a reevaluation of the characters used in their key, we feel that those entities are best regarded as geographical races of the species. This is justified largely by both the overlap in expressions of and the lack of correlation of the characters."